Recruitment for the Senate Ds has been pretty disappointing, still no candidates in the two states(NV,AZ) they must win to even break even in the Senate.
Kyrsten Sinema in AZ has clearly been fundraising with an eye towards a Senate run, and its clear other Democrats who may be interested are waiting for her decision. Nevada Democratic leadership seem to want Kate Marshall in NV, though that race is still kind of unclear.
Keep in mind that lots of successful recent swing-state Senate campaigns (like Cory Gardner's in 2014, or Angus King's in 2012) only kicked off the year of the election, rather than the year before. There's still plenty of time.
